Dynamic collection view cell size-objective c? - objective-c

Question

I am working on collection view in objective c,
My problem was
1.I want to change the cell size according to it's content size
2.If there are no image in cell then like and comment view should go above(refer image).
I have changed the constraint like
NSLayoutConstraint *newConstraint;
if([image isEqualToString:#"no_image.jpg"] || [image isEqualToString:#"no_image.jpg"]){
cell.desc_ImgViewWidth.constant = 0;
[cell.Descimgview setHidden:YES];
newConstraint = [NSLayoutConstraint constraintWithItem:(cell.bottomConstraint).firstItem attribute:(cell.bottomConstraint).firstAttribute relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:(cell.bottomConstraint).secondItem attribute:(cell.bottomConstraint).secondAttribute multiplier:(cell.bottomConstraint).multiplier constant:(cell.bottomConstraint).constant];
}
else{
cell.desc_ImgViewWidth.constant = 120;
[cell.Descimgview setHidden:NO];
newConstraint = [NSLayoutConstraint constraintWithItem:(cell.bottomConstraint).firstItem attribute:(cell.bottomConstraint).firstAttribute relatedBy:NSLayoutRelationEqual toItem:(cell.bottomConstraint).secondItem attribute:(cell.bottomConstraint).secondAttribute multiplier:(cell.bottomConstraint).multiplier constant:(cell.bottomConstraint).constant];
}
[cell.contentView removeConstraint:(cell.bottomConstraint)];
[cell.contentView addConstraint:newConstraint];
[cell layoutIfNeeded];
[[cell contentView] setFrame:[cell bounds]];
[[cell contentView] setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
in cellForItemAtIndexPath delegate method.(like and comment view moving above at first, but after reloading the cell again i.e, like scrolling etc the constraint is not working perfectly)
I want to move like and comment view like this and to reduce the cell height for that particular cell(refer below image)
How to properly do this?

Answer 1

You can use UICollectionViewLayout
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
if imageView != nil
{
return CGSizeMake(width, height)
}
else
{
return CGSizeMake(width, height)
}
}

Answer 2

Finally achieved like this,
- (CGSize)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary* object = [_Data objectAtIndex:indexPath.item];
NSString *image = [object valueForKey:#"image"];
if([image isEqualToString:#"no_image.jpg"] || [image isEqualToString:#"no_image.jpg"]){
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
float cellWidth = screenWidth;
NSDictionary* object = [_Data objectAtIndex:indexPath.item];
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:[SwiftHelper getEmojiText:[object valueForKey:#"description"]]];
[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:#"Georgia" size:15.0] range:NSMakeRange(0, str.length)];
CGSize sizeName = CGRectIntegral([str boundingRectWithSize:CGSizeMake(cellWidth-8, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin context:nil]).size;
NSMutableAttributedString *str1 = [[NSMutableAttributedString alloc] initWithString:[SwiftHelper getEmojiText:[object valueForKey:#"name"]]];
[str1 addAttribute:NSFontAttributeName value:[UIFont fontWithName:#"Georgia" size:15.0] range:NSMakeRange(0, str1.length)];
CGSize sizeName1 = CGRectIntegral([str1 boundingRectWithSize:CGSizeMake(cellWidth-8, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin context:nil]).size;
NSLog(#"%f,%f",sizeName.height,sizeName1.height);
if(sizeName.height > 100){
sizeName.height = 70;
}
return CGSizeMake(cellWidth, sizeName.height + sizeName1.height + 110);
}
else{
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
float cellWidth = screenWidth;
CGSize size = CGSizeMake(cellWidth, 182);
return size;
}
Thank you for your suggestions friends.
Really it's better to use tableview for this but unfortunately after using collection view for a previous design the requirement changed like this. So, I struggled.